FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars

Abstract

The $Fermi$ blazar observations show a strong correlation between $\gamma$-ray luminosities and spectral indices. BL Lac objects are less luminous with harder spectra than flat-spectrum radio quasars (FSRQs). Interestingly FSRQs are evident to exhibit a Keplerian disc component along with a powerful jet. We compute the jet intrinsic luminosities by beaming corrections determined by different cooling mechanisms. Observed $\gamma$-ray luminosities and spectroscopic measurements of broad emission lines suggest a correlation of the accretion disc luminosity with jet intrinsic luminosity. Also, theoretical and observational inferences for these jetted sources indicate a signature of hot advective accretion flow and a dynamically dominant magnetic field at jet-footprint. Indeed it is difficult to imagine the powerful jet launching from a geometrically thin Keplerian disc. We propose a magnetized, advective disc-outflow symbiosis with explicit cooling to address a unified classification of blazars by controlling both the mass accretion rate and magnetic field strength. The large scale strong magnetic fields influence the accretion dynamics, remove angular momentum from the infalling matter, help in the formation of strong outflows/jets, and lead to synchrotron emissions simultaneously. We suggest that the BL Lacs are more optically thin and magnetically dominated than FSRQs at the jet-footprint to explain their intrinsic $\gamma$-ray luminosities.

arXiv comment8 pages including 4 figures; Accepted for publication in MNRAS

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Cited by in corpus (8)

• Evaluating the classification of Fermi BCUs from the 4FGL Catalog Using Machine Learning
• A geometrical interpretation for the properties of multiband optical variability of the blazar S5 0716+714
• The Physical Properties of Changing-look Blazars
• Role of magnetically dominated disc-outflow symbiosis on bright hard-state black hole sources: ultra-luminous X-ray sources to quasars
• Long-term multiband optical variability of S5 0716+714 blazar
• The beaming effect for Fermi-LAT-detected FR-I radio galaxies
• The Gamma-ray Luminosity Function of Flat-Spectrum Radio Quasars
• Accretion into black hole, and formation of magnetically arrested accretion disks